I took a fresch backup (see the settings) and repeated. Still the message is:
"Some problems were detected when checking user data (Trying to restore user 'alisa.sample' from backup file will cause conflict, Trying to restore user 'admin' from backup file will cause conflict)"
I unzipped the backup file. moodle.xml has admin in two places:
there are many users in the form
Why there are so many users in the backup?
Just to make sure, my original idea of a cleaning the Moodle from old information should work, correct?